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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb52d71d1bdb109db26c10964205376c56b4300196581cf8ab063b692092e67' 
  AND token = 'ZNSWEB26Rb5NNILl1bCiiGA5JFRMwg3fPuua7PLRPKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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