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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3130eddc6afed201e825073b2563a83dec3a8c78b30fa741121aa7dc036750d3' 
  AND token = 'DWcfCLWdwK3NAm1Gw7C6cyymwpPo9HKAFH79feeQmsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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