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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d1c21d28a62cf3639ca706092c42ecd39e460628298b394584110b74a3d939' 
  AND token = 'ZtYy4cc6VqbxocaDKFh+5uoiSwBHjYqXSjyu8Hdjmc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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