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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6babf1e7c771674943ab04e57473b9861e97daaf23a53cc0469f590d0fb715' 
  AND token = 'WHuscZnn/V2gwuuuYo/37cQ/EyxI4x5YgDvmlh4LbbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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