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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a002c9407933ea28abf6ee9b84be475617561a4c81cf5458ef833e96dd1e745' 
  AND token = 'WjIu0Q8Heo6RDARWm/tHRy4dHt0P2VHliF2udS9vlHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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