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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd5acfc61bce05171c38db4079bfb51c5fdfbf3074c299fa7ddc950ae51878d' 
  AND token = 'pzKX8lWjXyibi6+uOR9dCe0SLHBMj7g9jGbUuBiRpQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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