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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff481d59207b08d46ad555694ebfd2bfd29b81009f7250aa485fc1006b769344' 
  AND token = 'PwNeRFiZTPLwyrHc6QljcX14qa9VMkX+VQXEbxH+sVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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