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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ca8ebd65e1a2fa612cef85da1733053e3212e5c686dee3a2ac9ee79c656f88' 
  AND token = 'YUwN1rNDy2UbW6NkwI/s+Xe59ttpS1ICT4cPKuPjE/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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