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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446bdbc241b79b78ccedfdc51d4826ea45c2fec0db508bf66fb923d34c9636ca' 
  AND token = 'qdW7ine1NWRV/dzH8YuigxDLB/4lWb1ww81cilz7Q44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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