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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923d07f547ac0bcf167713c7f25f609c9cf405e22462192a00e299cbad701b50' 
  AND token = 'VvnLXSJD/7ZaqAkt6rTGYwHZ5feL7Xm0ilqwgd+MROk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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