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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7c0803f77ffcde73209a3bce304b0459643a0beda8aa969ff7b9a58470dd0f' 
  AND token = 'f4E+dHPlIrmsPnnogBLgqYcaiSzluYRNlbbRulDU69o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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