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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7bccc57e21b12f3da76c22b7cd609c72133421eba949d63a554a0f8d561933' 
  AND token = '1V5+YNOLsSM7D4zoPoTnAgdd4x3ESE1J+jwaycyP5uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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