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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926a491a7242d45d9043f522d8b3dac78a954b898247ae72ff9bf054a3d7a0ab' 
  AND token = 'gwggHQA4QFei2TtkT6/tI9RJe1ZASq/e4jvdLU2GZn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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