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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1027a315c580c1a94486f5e0c2c7b9534fb1f837a031fe62d6ca09cb1008f237' 
  AND token = 'ph6wXmcRzezoW6cXCbRP7JAR3+i5xih+k+fBpSHePq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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