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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc1bb44cba4e622a9cfb1e904af2cf8d1f302867a5566fe4c08dd7dbf3a91cd' 
  AND token = 'a50Nht7g/DCefFZ0Eh7dM8yEeViZfm7ZBgqUlSQAgYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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