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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed2c4fcbe028c0d98b006f649df5b53de2f061b7911681f21b6acb271ca28d2' 
  AND token = 'tZvfIaJntthI+lpFB1dR/Z1q9BhJleyumAHNn1oTT38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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