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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc92883d4a89a25feeb48b321404414755335eea26aad77741c1c0a03d15c57' 
  AND token = 'dhOPGEEX/oZYgsXs7me5b0LGO20y5ob7/GQ/kNawmiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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