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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1add39ed28e35888b9d2a219655b9f41857024c39fe3b55f23e44455825af6' 
  AND token = 'yxyuD2e3cZayztjUE7lnJI8trpVi30/79hr0OjnPIwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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