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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4bed6d372758710e62cc03ded725ccd877530c534cd48827f4a5ed9bbb50c1f' 
  AND token = 'noqH21ibJ6p0ui0u4mMXxHqT/06nUEkSEQcUs57INVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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