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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439d6842ebbc37f9ecdcadfeacbbab1def074d4e80c8aa1c97ef3cacb86521c6' 
  AND token = '3MA3rKCEZjxZOa3MVixwh44/27CS1a0rIfdMQYyt5uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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