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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60dd36f54473f3ab4223723be4941e3f747a0b3cd80bfd1d42b7f23a1bccbbb7' 
  AND token = 'BP0omr7XHQX2FZW/BzDb2Sbk01qWxFjqktNFawgSNUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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