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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534843be5ae9f89cb0e346a61cf5faf3eeb8b7dc5c091be1a359ab653cd1ea5e' 
  AND token = '7X/SyhGlwgkqw8wC/7WJnBCTO/X3CHTfg7ObFz5jhbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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