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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d91d086d77611b6a0edabb6d77ff1c256daf3487701548d67cb62e58689d8c' 
  AND token = 'V0yWmIvFwYxQQwErH5QapZ2B+7yvGjU0baLbkiM+rEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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