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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db2f8e18cc8d9687cdee9c3e192a4204f139939305b1ea8309390d264d7d2f1' 
  AND token = 'fnonDtQWd+EaediXSMITEeOBshfStQ6kejPbL5mOGZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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