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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4e4c81b5db0f6fe3899cddc30fc05ce527c5268375f14809f4ff1cbc490f6f' 
  AND token = 'Md6Ijh5xQq85xSej4OQjDn5XQN32ztb1rE/o+wTAOZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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