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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bacad431649b55fe9d0d36303dac69d0d518e78687418933ff05ed5d3130be8' 
  AND token = 'whiSXwUJ/uoBofc53pc0ZoC2ssI5FDZ1D6ZSiw1JqR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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