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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2938231a68046f65675e4b327525c3e6b26446c5267b0170db9f740685b9dc55' 
  AND token = '59sJq4kZTybpZBlmMgII0BrzfEBrIJAXlLueMXsEQIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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