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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb34c081e34e2184da16b4c202beef653258e17e3deec2663fa7119deb8ac8e4' 
  AND token = '/Fy+6bPJpfJg2bkArI+HI6DwEvRfE8q3/4lV38AaO9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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