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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52013ceb6ff519a99b92f7a5aec3cb5a61b2293143aaf7dd3ece80b1bf53ba1c' 
  AND token = 'vF6KUIaJZ90B2XVBMzYim1nEJzOe5JI70OqybrnmkS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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