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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192fb87f77a98262054e585618f562b88b00666bbd5fc2df7883bcc05662c6aa' 
  AND token = '9TigNsggqnB1kbF4ie5G2n/PiPVFqp5GVXQfovV1HCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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