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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37770ba3fc2d0744ef3ad4afcf773ee03971f080bfb36123d6ed24b58089fc3' 
  AND token = 'JuUbTo7/3tcPiknPEo3n3rj4HhiAhhjOJXi1CkY9Bqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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