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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822c16753a006b26c2a5ff69a4afc07911c1e7309c601c769b4ce58606dc1826' 
  AND token = 'oui2mFaN7aa4balNpAQcj+0OuQKoRcffee1uIs3oucY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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