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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64f651bf3e5b7b410586ebf1e018469fc61bb21e175512270fa100ee2905005' 
  AND token = 'vExq2tM4XBm8n307vq1DpdvNR6hDYDgz25fM4Aa5ntk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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