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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a520349fc84cadfd9b17b1b08db32529d0c47031c46c73ebe1f514ef404f73' 
  AND token = 'r89aKoypf1PsF2klkmBIKdzil91o/LZr3wrdQx/TScE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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