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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c589c47223dad84f60d16ba9c1f9fe2817ebc602fff350a4dc23ddfb030596' 
  AND token = 'RaiUpaoqGI1NapHDCdGrZpoe8TYcvjcNnk3C8Js3k1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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