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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ab964ad1cc294b40be94f0f74fa758d61a93abbcebc94a6aa070617d90eaa9' 
  AND token = 'itNJoebcsbrn+MoEMCCT5k0IKFrp0EG7e7UM/ZlL2tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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