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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760b4d775c6ab713e0ca3d19a0ad0c0a595ef3e0598bf8606121b538a6526ea4' 
  AND token = 'o8U+0KuDJu8Mh3pWMpXj5jsQKP5f8O+M7H7n47Zjg7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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