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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f720356f9c6afc268f454ce7e8e6928834da1e08f3c9dac6b9e7cbe2f32dca' 
  AND token = 'lhVm8iDn+MbJSj15ddZJNPbhLnDLVZ2OGTjxEpOrigA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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