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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7669162144f00808883a3f2e244b9372c138c95ab6f771ae9e6eb15120c268e6' 
  AND token = 'DQ4pmMOorkYs4nFjOmgwHngSUuCn4Jlm46xSykH0j48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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