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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0494896d114128515fd76dea690ad30cf98cc679a3f2a82a1bf2730321400f' 
  AND token = 'OWiW7VMGCw3lc8gXylJzW4V8sdFdPVgkjFExqU5agDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}