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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd712c0c41684149c147081ab8f0f1c3fb709a18fb13d4478cd6ff236309e7cc8' 
  AND token = '+LhTSRPfspOl6krXppnw2NEgejZvirL+LWPtenBQUQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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