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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a2818618e491626123b08efe1cfa41ae2e683218aa97cf5da580ce81e1b72b' 
  AND token = '534nfVeecn3T2lj21P2JaSr+9grO3jrsjkfIV4Sjh34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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