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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d19a5f825aedbc9c8e5b1a06e1f145ea8927c1aeb6a8a68a73e873ab2d6b49' 
  AND token = '3YlVdyp4QpCByCL2SjRGSa/wwo8oGYYRiRJ9NLYn/rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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