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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28898fe8a7d5241e1b3e4ee7d150329b559f90311fa31c56a616c90d8b29a259' 
  AND token = 'Rma3fKf1pren4vggEc1vSJ0efG+1o/41dwl6nmkPXig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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