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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6ae0b316907a03daf1235eccc13fb3a492e88b2e2a261a0825587c7185c110' 
  AND token = 'nOCTxBpYjf8Vt2B1K+/sZvYI5eRlKY9z/WcKw9AdSb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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