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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb08a1079cb3121c8711428243a7d8cbca92e8a0a13716efa2d9ce4697261459' 
  AND token = 'oEgBOf4q1Z4eJebgX2f/PWIoGiwTM8pPOhWn6zwUnXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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