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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d507d31104bc739ea5616a3ff9e6b6aed78af07ed9cab6d4d3b7712d65938a0' 
  AND token = 'hx3hVA++FxcIdPE209BscrwteVKgPlNXEENt/VGpb9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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