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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c7b711cca0d73f6a6f4deec3b004a991c04b4093ab72d102ad3558f0c4e99d' 
  AND token = '/dgsub2veYTTcc74ojaOYBXOzsOYPGf4/aV6zS1cJJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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