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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdddd5d3fbadc8e7e43589baca9c04b3bc4bd15cccb58ce55ec0c4884eebe6f6' 
  AND token = 'Piuel86Rld9Q1v+Nr/tAC8k7jhVHTptJNstKe9M1DZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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