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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe118c700b483bbbbde2470cb6c6b7f203e903a081c6ac528fe1fb7514756de2' 
  AND token = 'Em+AfFC2JKmkfwy4i8WBp9zBQTgq+i586dO4Sd4dCKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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