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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c57852799cd146e53845719f82a6718aef3293b831a7e03ff3e53702dfd97e' 
  AND token = 'Hb3c8y0v0GO7JYbklGhzmNkmJKbIcMm2RS8ZVQWHUZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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