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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102d3d47f4034da1de05daacfc165cac9526decda65fe385fdcc5e1a67356e7f' 
  AND token = 'H6dMlLZ9HHBsJ/gSq+wxl+SCf6chUY5TUbeKtky9EOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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