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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9118dd4037ce503a4bc2aa6689f076fe49d42e8c496ea3adbef585b350f122' 
  AND token = 'wTO74hlbXYcCfZ8tRELy5tHXJ1L6mwrtVPbDNR9W820=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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