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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb393edf51c642592da12f6d2810a7976f5f13284581e0fbb0171d2c8c4a76d1' 
  AND token = 'KuAUrnpDd8hSnJVGI9lQJPkRNIlnB9VGcb3IfVG8fyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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