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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf2d20f811b0749558cf6ca072fe228e2ef38ffdd5b6340a262af7d53d6e9d3' 
  AND token = '6IQguknMeyi6cMDMUYmj7RzQ41vEw6BCpxci1fISr9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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