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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3520723bbae1849ef2846950f1b7e2b9456fda86c03bc003af83085220a9204' 
  AND token = 'MKoANTz1ckUqYzIROnDsabsgvJfNL5AJ54ef0p/d4hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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