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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69617e67df891d34470a83d877c6d3fa2e4fdb3ce284a3e36e6e22f2b7b3da0' 
  AND token = 'le7CLqsCbG9QU1zZbiHA8zLE90aOIalOV1amlcypnso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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