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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2a2c68caa7887084bebdcdcf54e13961ed41299d5d09bf11a8d4d0235c0299' 
  AND token = 'fM3T5etx6E2l+UWV5q9gDs8lT0urH3N8qS4vEio6acg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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